using BepInEx;
using BepInEx.Configuration;
using System;
using UnityEngine;

namespace UniformAim
{
    [BepInPlugin("com.greg.tarkovuniformaim", "Uniform Aim for Tarkov", "1.0.0")]
    [BepInProcess("EscapeFromTarkov.exe")]

    public class Plugin : BaseUnityPlugin
    {
        //Bepinex.Configurator fields
        public static ConfigEntry<int> configFOV;
        public static ConfigEntry<int> configCoeff;
        public static ConfigEntry<int> configSens;

        public static float mySens = 2f;

        // last FOV values for FPS Camera (Main camera) and baseOpticCamera(Clone) (Picture in picture for scopes)
        float lastFOV = -1f;
        float lastFOV2 = -1f;

        //human-friendly names for variables used later
        float FPSCameraFOV = -1f;
        float ScopeFOV = -1f;
        float currentFOV = -1f;

        //Return aspect ratio based on game window resolution
        float GetAspectRatio()
        {
            string screenWidth = Screen.width.ToString();
            string screenHeight = Screen.height.ToString();
            float resX = Convert.ToUInt16(screenWidth);
            float resY = Convert.ToUInt16(screenHeight);

            //Logger.LogInfo("GetAspectRatio(): resX: " + resX + " resY: " + resY);
            return (resX / resY);
        }
        //calculate horizontal FOV based on vertical FOV
        float CalculateHFOV(float FOV)
        {
            float vFOVRad = FOV * Mathf.Deg2Rad;
            float hFOVRad = (float)(2 * Math.Atan(Math.Tan(FOV / 2) * Mathf.Deg2Rad) * GetAspectRatio());

            return (float)(Math.Round(hFOVRad * Mathf.Rad2Deg));
        }
        //calculate sensitivity based on FOV difference and coefficient
        float CalculateSensitivity(float aimedFOV, float hipFOV, float mySens)
        {   //clamp to avoid invalid values
            aimedFOV = Mathf.Clamp(aimedFOV, 0.1f, 90f);
            hipFOV = Mathf.Clamp(hipFOV, 0.1f, 90f);

            //halve and convert to radians
            aimedFOV = aimedFOV / 2 * Mathf.Deg2Rad;
            hipFOV = hipFOV / 2 * Mathf.Deg2Rad;

            float exponent = (float)(100f / configCoeff.Value);

            float tanRatio = (float)(Math.Tan(aimedFOV) / Math.Tan(hipFOV));

            float sensitivity = (float)(configSens.Value/100f);
  
            float result = (float)Math.Pow(tanRatio, exponent) * sensitivity;

            return result;
        }

        void Awake()
        {
            //Enable uniform aim patch
            new UpdateSensitivityPatch().Enable();
            new get_AimingSensitivityPatch().Enable();

            //add configuration slider for field of view
            configFOV = Config.Bind("General", "FOV", 75, new ConfigDescription("In-game Field of View value", new AcceptableValueRange<int>(50, 75)));

            //add coefficient slider
            configCoeff = Config.Bind("General", "Coefficient", 133, new ConfigDescription("Coefficient - increases sensitivity at higher zoom levels", new AcceptableValueRange<int>(1, 300)));

            //add secondary sensitivity slider for greater control
            configSens = Config.Bind("General", "Sensitivity", 25, new ConfigDescription("Sensitivity while aiming", new AcceptableValueRange<int>(1, 200)));

        }

        void Update()
        {
            if (Camera.allCamerasCount >= 1)
            {
                FPSCameraFOV = Camera.allCameras[0].fieldOfView;
            }
            if (Camera.allCamerasCount >= 2)
            {
                ScopeFOV = Camera.allCameras[1].fieldOfView;
            }
            if (Camera.allCamerasCount >= 1 && FPSCameraFOV != lastFOV)
            {
                //Logger.LogInfo("[0] FOV: " + FPSCameraFOV);
                lastFOV = FPSCameraFOV;
            }
            if (Camera.allCamerasCount >= 2 && ScopeFOV != lastFOV2)
            {
                //Logger.LogInfo("[1] FOV: " + ScopeFOV);
                lastFOV2 = ScopeFOV;
            }

            //nasty workaround for sensitivity while using PIP scopes, WILL break when FOV is set to 50
            if (35 < FPSCameraFOV && FPSCameraFOV < configFOV.Value) { currentFOV = FPSCameraFOV; }
            if (Camera.allCamerasCount >= 2)
            {
                if (FPSCameraFOV == 35) { currentFOV = ScopeFOV; }
                if (FPSCameraFOV == configFOV.Value - 15) { currentFOV = FPSCameraFOV; }
            }

            mySens = CalculateSensitivity(currentFOV, configFOV.Value, configSens.Value);
        }
    }
}